.dv-border-box-1 {
  position: relative;
  width: 100%;
  height: 100%;
}

.dv-border-box-1 .dv-border-box-1-angle {
  position: absolute;
  width: 15px;
  height: 15px;
}

.dv-border-box-1 .dv-border-box-1-t-l {
  top: 0;
  left: 0;
}

.dv-border-box-1 .dv-border-box-1-t-r {
  top: 0;
  right: 0;
}

.dv-border-box-1 .dv-border-box-1-b-l {
  bottom: 0;
  left: 0;
}

.dv-border-box-1 .dv-border-box-1-b-r {
  right: 0;
  bottom: 0;
}
